Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 307 [Rate centres in NPA 307] [Dial plan for NPA 307]

NXX: 458

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-458 A Casper WY CHYNWYRFDMD  490J DISH WIRELESS, LLC 654   2024-01-15   
307-458 0 Casper WY CHYNWYRF2MD  939H COMMIO, LLC 654      
307-458 1 Casper WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654      
307-458 2 Casper WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654      
307-458 3 Casper WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654      
307-458 4 Casper WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654      
307-458 5 Casper WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654      
307-458 6 Casper WY CHYNWYMAX9X  879G TELEPORT COMMUNICATIONS AMERICA WY-LLC 654      
307-458 7 Casper WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654      
307-458 8 Casper WY CHYNWYMAX2X  450F ONVOY, LLC - WY 654      
307-458 9 Casper WY CHYNWYRFDMD  490J DISH WIRELESS, LLC 654      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.